Last.FM provides an API for getting art but you can't actually use it in publicly distributed applications. They said that the recording companies own the art and they aren't licensed to distribute it. Huh? Why the API then? I don't get it.
Last FM's album.getInfo API call offers images in four different sizes and can be searched using names or musicbrainz IDs. Output can be XML/JSON/JSONP.
Last.fm isn't completely free and unlimited
"Last.fm reserves the right to share in revenue generated from your use of Last.fm Data in future on terms to be negotiated in good faith between Last.fm and You."
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Discogs 或亚马逊 或看看封面提取器有吗？
How about Discogs, or Amazon or seeing what Cover Fetcher does?
Musicbrainz 和互联网档案馆提供封面艺术档案，但您确实需要使用专辑的MBID。
Musicbrainz and the Internet Archive offer the Cover Art Archive but you do need to request using the album's MBID.
Last.FM 提供了用于获取艺术的 API，但您实际上无法在公开分发的应用程序中使用它。他们说唱片公司拥有这些艺术作品，但他们没有获得发行它的许可。啊？那为什么要用API呢？我不明白。
Last.FM provides an API for getting art but you can't actually use it in publicly distributed applications. They said that the recording companies own the art and they aren't licensed to distribute it. Huh? Why the API then? I don't get it.
Last FM 的 album.getInfo API 调用提供四种不同尺寸的图像，并且可以搜索使用名称或 musicbrainz ID。输出可以是 XML/JSON/JSONP。
Last FM's album.getInfo API call offers images in four different sizes and can be searched using names or musicbrainz IDs. Output can be XML/JSON/JSONP.
Last.fm 并非完全免费且不受限制
“Last.fm 保留分享您未来使用 Last.fm 数据所产生的收入的权利，具体条款由 Last.fm 与您真诚协商确定。”
几分钟前发现 FreeCover 网站 API 搜索相同的内容：
http://www.freecovers.net/api/
根据记录，ROVi 似乎已加载（它们来源苹果）：
http://developer.rovicorp.com/
...但与互联网上的所有优质服务相同：如果您想要良好（意味着可靠）的服务，您最终必须付费；）
Last.fm isn't completely free and unlimited
"Last.fm reserves the right to share in revenue generated from your use of Last.fm Data in future on terms to be negotiated in good faith between Last.fm and You."
Discovered the FreeCover website API a few minutes ago searching for the same thing:
http://www.freecovers.net/api/
For the record, ROVi seems loaded (they source Apple):
http://developer.rovicorp.com/
...but same as every good service on the internet: if you want good (meaning reliable) service, you'll have to pay eventually ;)
除了封面艺术档案之外，唯一其他接近“免费”和无限的资源是维基百科：http://www.onemusicapi.com/blog/2014/09/10/querying-wikipedia-album-artwork/
你可以使用 DBpedia 搜索相册，然后使用 Wikimedia API 实际下载图像。
Other than the Cover Art Archive the only other approachably "free" and unlimited resource is Wikipedia: http://www.onemusicapi.com/blog/2014/09/10/querying-wikipedia-album-artwork/
You can use DBpedia to search for the album, then use the Wikimedia APIs to actually download the image.